Add scale-config.yml (#892)

Summary:
Pull Request resolved: #892

As title. We need to land this in master before adding GHA, similar to D33798276

Reviewed By: RenfeiChen-FB

Differential Revision: D33899959

fbshipit-source-id: a2fc63092bf7f69de3ed1be4d1cd3326bfca56a6

Author: jianyuh

.github/scale-config.yml

@@ -0,0 +1,16 @@
+runner_types:
+  linux.2xlarge:
+    instance_type: c5.2xlarge
+    os: linux
+    max_available: 200
+    disk_size: 150
+  linux.8xlarge.nvidia.gpu:
+    instance_type: p3.8xlarge
+    os: linux
+    max_available: 10
+    disk_size: 150
+  linux.4xlarge.nvidia.gpu:
+    instance_type: g3.4xlarge
+    os: linux
+    max_available: 10
+    disk_size: 150